I scrounged for the panels I know from Rebirth about Jason still having lingering pain and injuries from when the Joker killed him. We know Jason had substantial injuries and brain damage when he was resurrected, and Talia healed that with the Lazarus pit. But here’s some I know of being mentioned even after Talia healed him with the Lazarus pit.
The first I know of is when evil future Batman Tim targeted Jason’s hip because of a Joker-related injury that he claimed would eventually become debilitating for Jason. This move does take Jason out of the fight so it definitely seems like evil Tim successfully aggravated the injury.
Detective Comics #968 (Jan 2018) — earlier in #966 Batman Tim also mentioned future Jason would eventually lose an eye and a leg while fighting assassins.
More recently, regular, not-evil Tim referenced it while evaluating how to fight a Clayface Jason mimic:
Tim Drake: Robin #3 (Jan 2023) — Tim says the pit brought Jason back, which has sometimes been a thing. Originally Jason was only healed by the pit after he’d already been resurrected by something else.
This next one was black label, so it may or may not be canon (the creative team claims “it’s up to reader interpretation” and disagree on whether they personally think it is canon). I’m not a fan of the comic but it did pretty clearly indicate Jason had chronic pain from the Joker:
Batman: Three Jokers #2 (Nov 2020)
(There might be more than these—my reading of post flashpoint comics is kinda random and incomplete compared to my reading of post-Crisis. In post-Crisis though I think they mainly put emphasis on Jason’s destabilized mental health and didn’t really bring up physical aspects IIRC. His brain damage seemed healed and yet he seemed more affected after the pit than other one-time-in-the-pit characters like Dinah Lance or Cass Cain were.)
They haven’t bothered explaining how the pit didn’t heal them so far as I know (the pits kinda work to authorial convenience anyway). My route is usually to blame any weird Jason stuff on the strange, multiversal circumstances of his resurrection, but versions of his origin where he’s only brought back by the pit might not jive with that (which includes some Rebirth IIRC).
In any case, I do hope more writers pick up on this more and I love to see when it’s expanded upon a bit in fandom. I would already consider Jason’s mental health to be a disabling issue for him but it’s neat sometimes to have writers recognize chronic pain-related issues among DC characters. (I’d love to also see more expansion of Bruce mentioning he experienced chronic pain…it pops up every so often but rarely if ever in depth.)
Alt text is copied and expanded upon under read more below.
ID 1: Two panels from Detective Comics #968 showing Jason Todd as Red Hood leaping to fight evil future Batman Tim Drake. Jason says, “Sorry, Timmy, I don’t believe in Santa Claus.” Batman Tim slams his staff directly into Jason’s right hip joint, sending him flying back, and says, “Jason. In a few years you were going to learn that one of your bones never set right after the Joker killed you. There’s a growing debilitating bone spur in your hip joint. There, I found it for you you’re welcome.” They’re both in the batcave.
ID 2: A cropped panel from Tim Drake: Robin #3 showing a red narration box for Tim Drake which says: “The Lazarus Pit may have brought Jason back from the dead, but he’s still sensitive where The Joker killed him.”
ID 3: A comic page from Batman: Three Jokers #2. A Joker leans in Jason Todd’s face, looking intense and serious. The Joker says, “Who is the Joker, really? We’re going to find out.” The word “out” is written in an extended sing-songy way. The Jokers put Jason’s Red Hood helmet over his head but they’ve decorated it with a wide Joker-style grin. The two Jokers laugh, then one says, “We’ve spent considerable time trying to best answer that question: who is the Joker? We found that judge. A serial killer. A surgeon. All rather predictable and uninspiring. And then there’s you. Tell me something. Why would you put on that helmet and call yourself Red Hood after what we did?” Jason, who is sitting naked tied to the wooden chair, says, “Come on. Is every one of you copycats gonna ask me the same thing? It’s a joke.” One of the Jokers holds up a crowbar as the other says, “A joke? We left you with brain damage and permanent nerve pain. Physical and emotional trauma so severe that the only relief you ever find is when you inflict pain on others.” The Joker holds the crowbar by Jason’s head. “You and me, boy…..We’re more alike than you’d care to admit.”
ID 4: A comic page from Batman: Three Jokers #2 showing Jason Todd with no shirt on and small bandages on various parts of his arms and face. He looks at a calendar on a wall and reads the crossed out days that have physical therapy sessions written on them. He sees a stack of various healing and exercise books. The top book is titled Chronic Pain Management by Dr. D. Kresan. He picks it up. Barbara Gordon as Batgirl enters a different, dark room through a window.
ID 5: A comic page from Batman: Three Jokers #2 showing Barbara Gordon as Batgirl entering her own bedroom. She says, “Jason?” She sees a book on her bed titled “Chronic Pain Management” by Dr. D. Kresan. Jason says, “Barbara?” and walks out of the attached bathroom with only a towel around his waist. Babs says, “I figured you’d left.” Jason says, “I hope it’s okay I used the shower and I…I didn’t mean to go through your things. The closet door was open and that book looked…useful.” Babs says, “It was. Are you okay?” Jason has small bandages and bruises on his face as he says, “I don’t think I’ve ever been okay.” Babs looks concerned. Jason continues saying, “What the Joker said…about how I’ve been on the path to being like them for years…they’re not wrong. I don’t want to be like them though. I really don’t. You believe that, right?” Babs says, “I’m willing to.” Then Jason says, “Can I ask you something?”